The astronomical unit (AU) is defined to be equal to the
A) average distance between the Earth and the Sun
B) average distance between the Sun and the planet Pluto
C) distance between the Sun and the nearest star
D) diameter of the Earth

Question

Quizplus · Accepted Answer

The astronomical unit (AU) is defined as the average distance between the Earth and the Sun. It is used as a convenient way to express distances within our solar system. Choice B is incorrect because Pluto is no longer considered a planet. Choice C is incorrect because the nearest star, Proxima Centauri, is much farther away at a distance of about 4.2 light-years. Choice D is incorrect because the Earth's diameter is not related to the definition of the astronomical unit.

The Astronomical Unit (AU) Is Defined to Be Equal to the